使用循环构造:除了使用传统的for循环,还可以使用其他循环构造来替代嵌套的for循环,例如while循环和for...in循环。 使用while循环:可以使用while循环结构来读取输入,并在满足某个条件时执行命令。 例如,假设我们要计算数字1到10的平方,可以使用以下命令: i=1 while [ $i -le 10 ] do echo $((i*i)) i=$(...
Rules updates, options, and advice for Narrators. Limitations and Enhancements to help you customize your powers. This includes not only all the new ones developed for Awesome Powers, but also those previously published, so everything you need is all in one place!
它的语法与for...in循环基本一致。select name [in list] do commands doneBash 会对select依次进行下面的处理。select生成一个菜单,内容是列表list的每一项,并且每一项前面还有一个数字编号。 Bash 提示用户选择一项,输入它的编号。 用户输入以后,Bash 会将该项的内容存在变量name,该项的编号存入环境变量REPLY。
def gen_pass(n=8): result = [random.chice(all_chs) for i in range(n)] return ''.join(result) def adduser(user, password, fnme): info = '''用户信息: 用户名: %s 密码: %s ''' % (user, password) rc = subprocess.run( 'id %s' % user, shell=True, stdout=subprocess.PIPE, ...
1.3 for-in 遍历数字范围 遍历 全数范围(full number range), 示例: $ cat temp.sh #!/bin/bash for i in {1..5}; do echo "value: $i" done echo "===" for i in {01..05}; do echo "value: $i" done $ ./temp.sh value:...
问使用bash/xlsx2csv迭代从XLS转换到CSV的文件EN最近在使用遇到一个问题需要把csv格式的文件转成xls，...
for i in {1..4}do echo $idone 上面例子会循环4次。 如果整数前面有前导0,扩展输出的每一项都有前导0。 $ echo {01..5} 01 02 03 04 05 $ echo {001..5} 001 002 003 004 005 这种简写形式还可以使用第二个双点号(start..end..step),用来指定扩展的步长。
In this article, we will cover the basics of for loops in Bash and show you how to use the break and continue statements to alter the flow of a loop.
Though, the possible value range for the return builtin is limited to the least significant 8 bits which are 0 to 255. Any number above 255 will just return a zero value. If a non-number is used, an error bash: return: string: numeric argument required will occur and the return built...
In the following example, we specify the first set for the range of IPs and define the range using a “for” loop. In the “do” section, we set it to execute the “ping” command for each iteration in the range. Watch how we use the Bash “for” loops to automate the process an...